import cv2
import numpy as np
from matplotlib import pyplot as plt

img = cv2.imread('sudu.jpeg')
rows,cols,ch = img.shape

pts1 = np.float32([[55,254],[726,293],[18,929],[697,925]])
pts2 = np.float32([[0,0],[600,0],[0,596],[599,565]])

M = cv2.getPerspectiveTransform(pts1,pts2)

dst = cv2.warpPerspective(img,M,(600,600))

plt.subplot(121),plt.imshow(img),plt.title('Input')
plt.subplot(122),plt.imshow(dst),plt.title('Output')
plt.show()